Integrated confocal optical pick-up head with a hologram and a p

Details Integrated confocal optical pick-up head with a hologram and a p Integrated confocal optical pick-up head with a hologram and a p

1996-02-26

1997-12-30

Nelms, Daid C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369122, 369103, H01S 318, G11B 7135

Patent

active

057038619

ABSTRACT:
Light is emitted from a light-emitting element toward an irradiated medium, and returning light reflected by the irradiated medium is diffracted by a hologram device. A polarizer polarizes the light diffracted by the hologram device to produce first polarized light that has passed through the polarizer and second polarized light that has been reflected by the polarizer. The first polarized light is detected by a first light-detecting element, and the second polarized light is detected by a second light-detecting element. A magnetooptical signal is generated as the difference between the intensities of the first and second polarized lights which are detected respectively by the first and second light-detecting elements.

REFERENCES:
patent: 4918675 (1990-04-01), Lee
patent: 5231620 (1993-07-01), Ohuchida
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5410468 (1995-04-01), Horinouchi
patent: 5517479 (1996-05-01), Nakanishi et al.
patent: 5568463 (1996-10-01), Sahara et al.
Patent Abstracts of Japan, vol. 017, No. 519 (P-1615), Sep. 17, 1993 & P-A-05 135420 (Sharp Corp.), Jun. 1, 1993.

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